Samsung UN55F8000AFXZA - Manual (Page 165)

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Subtitle and Media Contents file formats, and Codec
Subtitle
External
Name File Extension
MPEG-4 Timed text .ttxt
SAMI .smi
SubRip .srt
SubViewer .sub
Micro DVD .sub or .txt
SubStation Alpha .ssa
Advanced SubStation Alpha .ass
Powerdivx .psb
Internal
Name Container
Xsub AVI
SubStation Alpha MKV
Advanced SubStation Alpha MKV
SubRip MKV
MPEG-4 Timed text MP4